Kx3 RxIQ
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Can I use this output to a separate computer as a 2nd receiver while using another computer to run HRD etc?
KD5SPX Wayne ******* Notice ******** The information contained in this e-mail, including attachments, may contain confidential information that is intended solely for the use of the individual or entity to which it is addressed. If you are not the intended recipient, or the person responsible for delivering this message to the intended recipient, you are hereby notified that any review, dissemination, distribution, copying or other use of, or taking any action in reliance upon this information is strictly prohibited. If you have received this communication in error, please contact the sender immediately and then delete the material from your computer. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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Yes you can.
I used to do this with an iPad (a tablet computer) running iSDR and a piglet connected into the ACC1 jack. I used Hamlog to control the KX3 and iSDR to view the RX I/O. I decided to buy the PX3 (i.e., a specialized computer) instead, though, as its power consumption seems better than the iPad. Plus, flip flopping back and forth between iSDR and Hamlog wasn't helping me be productive. You can never have too many screens :-) Now I use the PX3 as my panadapter instead of iSDR and can still use another computer to control the KX3 (PX3 has a pass through ACC1 jack). On the horizon...I am excited about the Raspberry Pi 2 (on back order) as this platform can support a number of Ham oriented programs I like to use (FLDigi, WSJT-X). Current draw for field work is about an amp-hour and I can use my iPad to VNC into the R-Pi. For field day or more coordinated events, I would just bring a monitor and connect that to the R-PI. regards, Brian VE3IBW On Mon, Feb 16, 2015 at 8:34 AM, Suite, Wayne <[hidden email]> wrote: > Can I use this output to a separate computer as a 2nd receiver while using > another computer to run HRD etc? > > KD5SPX > Wayne > > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email]
Regards,
Brian VE3IBW |
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I'm quite interested in experimenting in this area. I've been playing
around with SDR via gnuradio with a cheap TV tuner dongle. Can someone please explain the characteristics of the signal coming from the IF Out port on the K3? Is it basically in the audio domain? Is it this connector that would plug into the P3? I'd like to experiment with viewing the signal spectrum using something similar to gnuradio. Brian, how did you connect your KX3 to the iPad? Thanks, Chris On Mon, Feb 16, 2015 at 8:54 AM, Brian Waterworth <[hidden email]> wrote: > Yes you can. > > I used to do this with an iPad (a tablet computer) running iSDR and a > piglet connected into the ACC1 jack. I used Hamlog to control the KX3 and > iSDR to view the RX I/O. I decided to buy the PX3 (i.e., a specialized > computer) instead, though, as its power consumption seems better than the > iPad. Plus, flip flopping back and forth between iSDR and Hamlog wasn't > helping me be productive. You can never have too many screens :-) > > Now I use the PX3 as my panadapter instead of iSDR and can still use > another computer to control the KX3 (PX3 has a pass through ACC1 jack). > > On the horizon...I am excited about the Raspberry Pi 2 (on back order) as > this platform can support a number of Ham oriented programs I like to use > (FLDigi, WSJT-X). Current draw for field work is about an amp-hour and I > can use my iPad to VNC into the R-Pi. For field day or more coordinated > events, I would just bring a monitor and connect that to the R-PI. > > regards, > Brian > VE3IBW > > On Mon, Feb 16, 2015 at 8:34 AM, Suite, Wayne <[hidden email]> wrote: > >> Can I use this output to a separate computer as a 2nd receiver while using >> another computer to run HRD etc? >> >> KD5SPX >> Wayne >> >> >> > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [hidden email] -- Life is like Linux - it never stands still. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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If you already have gnuradio you could try this https://github.com/g0hww/gr-kx3 Cheers, 73 Darren, G0HWW Sent from my iPhone > On 16 Feb 2015, at 14:34, Chris Hallinan <[hidden email]> wrote: > > I'm quite interested in experimenting in this area. I've been playing > around with SDR via gnuradio with a cheap TV tuner dongle. Can > someone please explain the characteristics of the signal coming from > the IF Out port on the K3? Is it basically in the audio domain? Is it > this connector that would plug into the P3? I'd like to experiment > with viewing the signal spectrum using something similar to gnuradio. > > Brian, how did you connect your KX3 to the iPad? > > Thanks, > > Chris > > > On Mon, Feb 16, 2015 at 8:54 AM, Brian Waterworth > <[hidden email]> wrote: >> Yes you can. >> >> I used to do this with an iPad (a tablet computer) running iSDR and a >> piglet connected into the ACC1 jack. I used Hamlog to control the KX3 and >> iSDR to view the RX I/O. I decided to buy the PX3 (i.e., a specialized >> computer) instead, though, as its power consumption seems better than the >> iPad. Plus, flip flopping back and forth between iSDR and Hamlog wasn't >> helping me be productive. You can never have too many screens :-) >> >> Now I use the PX3 as my panadapter instead of iSDR and can still use >> another computer to control the KX3 (PX3 has a pass through ACC1 jack). >> >> On the horizon...I am excited about the Raspberry Pi 2 (on back order) as >> this platform can support a number of Ham oriented programs I like to use >> (FLDigi, WSJT-X). Current draw for field work is about an amp-hour and I >> can use my iPad to VNC into the R-Pi. For field day or more coordinated >> events, I would just bring a monitor and connect that to the R-PI. >> >> regards, >> Brian >> VE3IBW >> >>> On Mon, Feb 16, 2015 at 8:34 AM, Suite, Wayne <[hidden email]> wrote: >>> >>> Can I use this output to a separate computer as a 2nd receiver while using >>> another computer to run HRD etc? >>> >>> KD5SPX >>> Wayne >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:[hidden email] >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> Message delivered to [hidden email] > > > > -- > Life is like Linux - it never stands still. > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [hidden email] Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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In reply to this post by Chris Hallinan
Hi Chris,
Wirelessly (wlan) through the pignology piglet for rig control. The piglet establishes a hotspot to which the iPad will connect. I used the Apple camera adapter (lightning port version for iPad Air) coupled to a Griffin iMic. The camera adapter is poorly named as it really just offers a USB port to the iPad. The KX3 RX I/O plugs into the stereo input connector of the iMic; must use a USB sound card with stereo input as many USB sound cards do not have stereo mic inputs. Also, the USB sound cards (small USB drive like devices) seldom have wide bandwidth ( > 44.1khz). Another reason the PX3 is so nice as it has 200 khz bandwidth. Note: iSDR will actually recognize the piglet and use it for rig control when the piglet is wirelessly connected to the iPad. So, Hamlog and iSDR both use the piglet; a nice bonus when more than one app will use the hardware. There are lots of youtube videos of Hams who have this set-up if you are interested to learn more from actual tutorial-like experiences. That is how I learned. Have a look at Jerry Taylor's channel (KD0BIK) on youtube and specifically the KX3 videos. They helped me a lot. There are also videos from other hams on iSDR, Griffin iMic, iPad, and the KX3. regards, Brian VE3IBW On Mon, Feb 16, 2015 at 9:34 AM, Chris Hallinan <[hidden email]> wrote: > > > Brian, how did you connect your KX3 to the iPad? > > > > > > -- > Life is like Linux - it never stands still. > Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email]
Regards,
Brian VE3IBW |
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In reply to this post by Chris Hallinan
Chris,
If you are going after the K3 IF output, it is a single audio signal at the IF frequency. You will need to downconvert it to baseband and split it into two streams, one of which will need to be shifted by 90 degrees. It is these signals that go to a good sound card for playing. It will be the only way it will work. The P3 does everything it needs for spectrum display. The KX3 already gives baseband audio streams that are separated by 90 degrees meaning all you need to do is feed the streams to your sound card and operate on it with software. 73, Barry K3NDM On 2/16/2015 9:34 AM, Chris Hallinan wrote: > I'm quite interested in experimenting in this area. I've been playing > around with SDR via gnuradio with a cheap TV tuner dongle. Can > someone please explain the characteristics of the signal coming from > the IF Out port on the K3? Is it basically in the audio domain? Is it > this connector that would plug into the P3? I'd like to experiment > with viewing the signal spectrum using something similar to gnuradio. > > Brian, how did you connect your KX3 to the iPad? > > Thanks, > > Chris > > > On Mon, Feb 16, 2015 at 8:54 AM, Brian Waterworth > <[hidden email]> wrote: >> Yes you can. >> >> I used to do this with an iPad (a tablet computer) running iSDR and a >> piglet connected into the ACC1 jack. I used Hamlog to control the KX3 and >> iSDR to view the RX I/O. I decided to buy the PX3 (i.e., a specialized >> computer) instead, though, as its power consumption seems better than the >> iPad. Plus, flip flopping back and forth between iSDR and Hamlog wasn't >> helping me be productive. You can never have too many screens :-) >> >> Now I use the PX3 as my panadapter instead of iSDR and can still use >> another computer to control the KX3 (PX3 has a pass through ACC1 jack). >> >> On the horizon...I am excited about the Raspberry Pi 2 (on back order) as >> this platform can support a number of Ham oriented programs I like to use >> (FLDigi, WSJT-X). Current draw for field work is about an amp-hour and I >> can use my iPad to VNC into the R-Pi. For field day or more coordinated >> events, I would just bring a monitor and connect that to the R-PI. >> >> regards, >> Brian >> VE3IBW >> >> On Mon, Feb 16, 2015 at 8:34 AM, Suite, Wayne <[hidden email]> wrote: >> >>> Can I use this output to a separate computer as a 2nd receiver while using >>> another computer to run HRD etc? >>> >>> KD5SPX >>> Wayne >>> >>> >>> >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:[hidden email] >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> Message delivered to [hidden email] > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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Thanks Barry, that explanation helps alot. So I'm assuming that the
IF output of the K3 is a very traditional IF as in other radios, ie it's not Quadrature, etc. Would that be correct? If so, another approach would be to feed into an A/D, and then do the rest in software, ie gnuradio. I wouldn't be surprised to find out that gnuradio already supports similar configurations, including down converting (for certain), splitting and creating the quadrature output (unknown). Sounds like a fun project. Wish I had time to pursue it!! ;) If I'm reading the block diagram correctly, it looks like an 8.125 MHz IF. -Chris On Mon, Feb 16, 2015 at 11:03 AM, Barry LaZar <[hidden email]> wrote: > Chris, > If you are going after the K3 IF output, it is a single audio signal at > the IF frequency. You will need to downconvert it to baseband and split it > into two streams, one of which will need to be shifted by 90 degrees. It is > these signals that go to a good sound card for playing. It will be the only > way it will work. The P3 does everything it needs for spectrum display. The > KX3 already gives baseband audio streams that are separated by 90 degrees > meaning all you need to do is feed the streams to your sound card and > operate on it with software. > > 73, > Barry > K3NDM > > > > On 2/16/2015 9:34 AM, Chris Hallinan wrote: >> >> I'm quite interested in experimenting in this area. I've been playing >> around with SDR via gnuradio with a cheap TV tuner dongle. Can >> someone please explain the characteristics of the signal coming from >> the IF Out port on the K3? Is it basically in the audio domain? Is it >> this connector that would plug into the P3? I'd like to experiment >> with viewing the signal spectrum using something similar to gnuradio. >> >> Brian, how did you connect your KX3 to the iPad? >> >> Thanks, >> >> Chris >> >> >> On Mon, Feb 16, 2015 at 8:54 AM, Brian Waterworth >> <[hidden email]> wrote: >>> >>> Yes you can. >>> >>> I used to do this with an iPad (a tablet computer) running iSDR and a >>> piglet connected into the ACC1 jack. I used Hamlog to control the KX3 >>> and >>> iSDR to view the RX I/O. I decided to buy the PX3 (i.e., a specialized >>> computer) instead, though, as its power consumption seems better than the >>> iPad. Plus, flip flopping back and forth between iSDR and Hamlog wasn't >>> helping me be productive. You can never have too many screens :-) >>> >>> Now I use the PX3 as my panadapter instead of iSDR and can still use >>> another computer to control the KX3 (PX3 has a pass through ACC1 jack). >>> >>> On the horizon...I am excited about the Raspberry Pi 2 (on back order) as >>> this platform can support a number of Ham oriented programs I like to use >>> (FLDigi, WSJT-X). Current draw for field work is about an amp-hour and I >>> can use my iPad to VNC into the R-Pi. For field day or more coordinated >>> events, I would just bring a monitor and connect that to the R-PI. >>> >>> regards, >>> Brian >>> VE3IBW >>> >>> On Mon, Feb 16, 2015 at 8:34 AM, Suite, Wayne <[hidden email]> >>> wrote: >>> >>>> Can I use this output to a separate computer as a 2nd receiver while >>>> using >>>> another computer to run HRD etc? >>>> >>>> KD5SPX >>>> Wayne >>>> >>>> >>>> >>> ______________________________________________________________ >>> Elecraft mailing list >>> Home: http://mailman.qth.net/mailman/listinfo/elecraft >>> Help: http://mailman.qth.net/mmfaq.htm >>> Post: mailto:[hidden email] >>> >>> This list hosted by: http://www.qsl.net >>> Please help support this email list: http://www.qsl.net/donate.html >>> Message delivered to [hidden email] >> >> >> > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [hidden email] -- Life is like Linux - it never stands still. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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Chris,
The IF out on the K3 is straight IF as it is going to be used in the radio. That is correct. It is not useable as it is for DSP purposes without a little work. The absolute simplest is to order a LP-Pan for the K3. It takes the IF out and gives you baseband I&Q analog streams to be used for your purposes. Let me get a little technical. You must have a way to discern not only amplitude but phase information. By obtaining this information you can describe all of the signal information present in the streams. Doing a A/D on two streams of analog data that has a known phase shift between them allows for this. Quadrature is the easiest, IMHO, so that is why that is what is used. You could use the IF out and split it into two analog streams, shift one 90 degrees, and then do an A/D on them. However, getting a good A/D converters that operates at least 2X the K3's IF frequency is going to be expensive, and you probably want to over sample at 3-4 times the IF frequency. Going to baseband allows you to do it all with a $50-%100 sound card, simple minded economics and engineering. And it turns out that sound cards can do a superior job. The real trick in making a good SDR is making sure you don't overload the A/D converter and while making sure you receiver has enough sensitivity to not be internally limited by noise. Good sound cards have 24 bit A/D converters that should allow over 100 db dynamic range and most have pretty good internal noise figures. So, if you are really careful about gain distribution in the analog portions of your radio, you can end up with quite a radio. Elecraft is a prime example of this in both the K3 and the KX3. Hopefully, I have given you enough to think about to figure out what you want to do. Of course, there are number of ways to go, Ask a room full of engineers for an answer and I'd be shocked if you didn't get a room full of answers. The reason is that there are lots of compromises and which ones you make are how you view things. Very best of luck in where you want to go. 73, Barry K3NDM On 2/16/2015 12:49 PM, Chris Hallinan wrote: > Thanks Barry, that explanation helps alot. So I'm assuming that the > IF output of the K3 is a very traditional IF as in other radios, ie > it's not Quadrature, etc. Would that be correct? > > If so, another approach would be to feed into an A/D, and then do the > rest in software, ie gnuradio. I wouldn't be surprised to find out > that gnuradio already supports similar configurations, including down > converting (for certain), splitting and creating the quadrature output > (unknown). Sounds like a fun project. Wish I had time to pursue it!! > ;) > > If I'm reading the block diagram correctly, it looks like an 8.125 MHz IF. > > -Chris > > On Mon, Feb 16, 2015 at 11:03 AM, Barry LaZar <[hidden email]> wrote: >> Chris, >> If you are going after the K3 IF output, it is a single audio signal at >> the IF frequency. You will need to downconvert it to baseband and split it >> into two streams, one of which will need to be shifted by 90 degrees. It is >> these signals that go to a good sound card for playing. It will be the only >> way it will work. The P3 does everything it needs for spectrum display. The >> KX3 already gives baseband audio streams that are separated by 90 degrees >> meaning all you need to do is feed the streams to your sound card and >> operate on it with software. >> >> 73, >> Barry >> K3NDM >> >> >> >> On 2/16/2015 9:34 AM, Chris Hallinan wrote: >>> I'm quite interested in experimenting in this area. I've been playing >>> around with SDR via gnuradio with a cheap TV tuner dongle. Can >>> someone please explain the characteristics of the signal coming from >>> the IF Out port on the K3? Is it basically in the audio domain? Is it >>> this connector that would plug into the P3? I'd like to experiment >>> with viewing the signal spectrum using something similar to gnuradio. >>> >>> Brian, how did you connect your KX3 to the iPad? >>> >>> Thanks, >>> >>> Chris >>> >>> >>> On Mon, Feb 16, 2015 at 8:54 AM, Brian Waterworth >>> <[hidden email]> wrote: >>>> Yes you can. >>>> >>>> I used to do this with an iPad (a tablet computer) running iSDR and a >>>> piglet connected into the ACC1 jack. I used Hamlog to control the KX3 >>>> and >>>> iSDR to view the RX I/O. I decided to buy the PX3 (i.e., a specialized >>>> computer) instead, though, as its power consumption seems better than the >>>> iPad. Plus, flip flopping back and forth between iSDR and Hamlog wasn't >>>> helping me be productive. You can never have too many screens :-) >>>> >>>> Now I use the PX3 as my panadapter instead of iSDR and can still use >>>> another computer to control the KX3 (PX3 has a pass through ACC1 jack). >>>> >>>> On the horizon...I am excited about the Raspberry Pi 2 (on back order) as >>>> this platform can support a number of Ham oriented programs I like to use >>>> (FLDigi, WSJT-X). Current draw for field work is about an amp-hour and I >>>> can use my iPad to VNC into the R-Pi. For field day or more coordinated >>>> events, I would just bring a monitor and connect that to the R-PI. >>>> >>>> regards, >>>> Brian >>>> VE3IBW >>>> >>>> On Mon, Feb 16, 2015 at 8:34 AM, Suite, Wayne <[hidden email]> >>>> wrote: >>>> >>>>> Can I use this output to a separate computer as a 2nd receiver while >>>>> using >>>>> another computer to run HRD etc? >>>>> >>>>> KD5SPX >>>>> Wayne >>>>> >>>>> >>>>> >>>> ______________________________________________________________ >>>> Elecraft mailing list >>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft >>>> Help: http://mailman.qth.net/mmfaq.htm >>>> Post: mailto:[hidden email] >>>> >>>> This list hosted by: http://www.qsl.net >>>> Please help support this email list: http://www.qsl.net/donate.html >>>> Message delivered to [hidden email] >>> >>> >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:[hidden email] >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> Message delivered to [hidden email] > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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In reply to this post by Suite, Wayne
K3 IF output is simply the 1st IF=8.215 MHz which is simple RF
covering a wide bandwidth. Simple way to generate IQ baseband audio is with any of the inexpensive SDR's. I use the LP-Pan which was specifically designed for the K3 IF. the LP-Pan has a input bandwidth of about 400-KHz. I use either a emu-0202 which can support 192-KHz or a Delta44 which supports 90-KHz audio. Elecraft responded to customer desires and included IQ baseband output for the KX3, so one only needs a decent audio interface to a soundcard. You can make one yourself. Its on my lengthy "to-do" list. 73, Ed - KL7UW To: Barry LaZar <[hidden email]> Cc: "<[hidden email]>" <[hidden email]> Subject: Re: [Elecraft] Kx3 RxIQ Message-ID: <[hidden email]> Content-Type: text/plain; charset=ISO-8859-1 Thanks Barry, that explanation helps alot. So I'm assuming that the IF output of the K3 is a very traditional IF as in other radios, ie it's not Quadrature, etc. Would that be correct? If so, another approach would be to feed into an A/D, and then do the rest in software, ie gnuradio. I wouldn't be surprised to find out that gnuradio already supports similar configurations, including down converting (for certain), splitting and creating the quadrature output (unknown). Sounds like a fun project. Wish I had time to pursue it!! ;) If I'm reading the block diagram correctly, it looks like an 8.125 MHz IF. -Chris 73, Ed - KL7UW http://www.kl7uw.com "Kits made by KL7UW" Dubus Mag business: [hidden email] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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